这项对七个使用臭氧氧化和过滤的水处理厂的初步调查证实，臭氧氧化过程中醛的生成非常丰富，其中双醛乙二醛和甲基乙二醛最为丰富。在生物模式下运行时，臭氧氧化后的过滤似乎能有效去除大部分醛类。然而，没有确凿的证据表明，预分区或后续过滤都可以完全去除后消毒剂形成的前体。

This initial survey of seven water treatment plants using ozonation and filtration provides confirmation that aldehyde formation is quite prolific during ozonation, with the dialdehydes glyoxal and methyl glyoxal being the most abundant. Filtration following ozonation seems to be effective in removing a large percentage of these aldehydes when operating in a biological mode. However, there is no firm evidence to show that either preozonation or subsequent filtration can completely remove the precursors to their formation by post-disinfectants.